tests/qtest/migration: Introduce find_common_machine_version

When using two different QEMU binaries for migration testing, we'll
need to find what is the machine version that will work with both
binaries. Add a helper for that.

Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231018192741.25885-7-farosas@suse.de>
2 files changed